diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index 9b8389919..b01aa08cc 100755
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -98,6 +98,10 @@ function configure_mistral {
     if [ "$LOG_COLOR" == "True" ] && [ "$SYSLOG" == "False" ]; then
         setup_colorized_logging $MISTRAL_CONF_FILE DEFAULT tenant user
     fi
+
+    if [ "$MISTRAL_RPC_IMPLEMENTATION" ]; then
+        iniset $MISTRAL_CONF_FILE DEFAULT rpc_implementation $MISTRAL_RPC_IMPLEMENTATION
+    fi
 }